<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>百度下拉列表</title>
    <script src="vue.js"></script>
    <script src="vue-resource.js"></script>
    <style>
        .gray{
            background:#ccc ;
        }
    </style>
    <script>
        window.onload=function () {
            new Vue({
                el:'body',
                data:{
                    myData:[],
                    t1:'',
                    now:-1
                },
                methods:{
                     get:function (ev) {
                         if(ev.keyCode==38||ev.keyCode==40)return;
                         if(ev.keyCode==13){
                             window.open("https://www.baidu.com/s?wd="+this.t1);
                             this.t1='';
                         }
                         this.$http.jsonp('https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su',
                             {
                                 wd:this.t1
                         },{
                             jsonp:"cb"
                             }).then(function (res) {
                            this.myData=res.data.s;
                         },function () {

                         });
                     },
                    changeDown:function () {
                        this.now++;
                        if(this.now==this.myData.length)this.now=-1;
                        this.t1=this.myData[this.now];
                    },
                    changeUp:function () {
                        this.now--;
                        if(this.now==-2)this.now=this.myData.length-1;
                        this.t1=this.myData[this.now];
                    }
                }
            })
        }
    </script>
</head>
<body>
<div id="box">
    <ul>
        <input type="text" v-model="t1" @keyup="get($event)" @keydown.down="changeDown()" @keydown.up.prevent="changeUp()">
        <li v-for="value in myData" :class="{gray:$index==now}">{{value}}</li>
    </ul>
<p v-show="myData.length==0">暂无数据...</p>
</div>
</body>
</html>